电磁场理论（第四章） Electromagnetic Field Theory ( Ch.4)

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Presentation transcript:

电磁场理论（第四章） Electromagnetic Field Theory ( Ch.4) 盛新庆（Sheng Xin-Qing）电磁仿真中心（Center for Electromagnetic Simulation）北京理工大学信息科学技术学院（School of Information Science and Technology，Beijing Institute of Technology）电子信箱： xsheng@bit.edu.cn 电话: 68949049 http://grd.bit.edu.cn/daoshi/博导网页/盛新庆.htm http://www.cems.bj.cn

Scattering of EM Wave Scattering Determined Targets Random Targets Targets in free space Targets in layered medium Random Surface Random volume targets Small rough random surface Regular Targets Irregular Targets Smooth random surface Rough random surface Cylinder 2D Sphere 3D Numerical Methods

Scattering by an 2D Cylinder

Scattering by an 2D Cylinder

Scattering by an 2D Cylinder

Scattering by an 2D Cylinder

Scattering by an 2D Cylinder

Scattering by an 2D Cylinder Echo Width

Scattering by an 2D Cylinder

Scattering by an 2D Cylinder 。

Scattering by Conducting Sphere The scattering field of a plane EM wave by a conducting sphere can be analytically expressed. Radar Cross Section (RCS) Monostatic RCS, Backscatter RCS, Bistatic RCS Vertical Polarization (VV-Pol), Horizontal Pol. (HH-Pol), Cross Polarization

Scattering by Conducting Sphere

Analytical Approcah for Scattering by Regular Targets Choose a suitable coordinate system, construct a complete eigenfunction system. Express the incident field and scattering field with unknown coefficients with the eigenfunctions, then determine the unknown coefficients according to the boundary condition How to express the incident field with the eigenfunction?

Transformation from plane wave to cylindrical wave

Transformation of cylindrical wave at cylindrical coordinates with different origion

Transformation of cylindrical wave at cylindrical coordinates with different origins

Scattering by Irregular Targets Full Wave Numerical Method

Mechanism of Scattering

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